Myalarm V-LCD1 Bedienungsanleitung PDF herunterladen (Seite 23)

MC5701 LCD Driver

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- CONTROL DATA FUNCTIONS

1. CT0 TO CT2: Control data that sets the display contrast

This control data is used to set the display contrast.

CT0 to CT2: Display contrast setting (7 steps)

CT0

CT1

CT2

LCD drive 1/3 bias voltage power supply (VLCD0) level

1.00 VLCD [ VLCD – (0.05 VLCD x 0)]

0.95 VLCD [ VLCD – (0.05 VLCD x 1)]

0.90 VLCD [ VLCD – (0.05 VLCD x 2)]

0.85 VLCD [ VLCD – (0.05 VLCD x 3)]

0.80 VLCD [ VLCD – (0.05 VLCD x 4)]

0.75 VLCD [ VLCD – (0.05 VLCD x 5)]

0.70 VLCD [ VLCD – (0.05 VLCD x 6)]

Note that although the display contrast can be adjusted by operating the built-in display contrast

adjustment circuit, it is also possible to adjust the contrast by varying the voltage level on the LCD drive

block power supply VLCD pin. However, VLCD0 must always be greater than or equal to 2.7V.

2. DR: 1/2 BIAS Drive or 1/3 BIAS Drive switching Control data

This control data bit selects either 1/2 bias drive or 1/3 bias drive when the STATIC pin is low level.

STATIC Pin Input

Bias Drive Scheme

Low level

1/3 bias drive

1/2 bias drive

High level

Always “0”

static drive

3. DT: 1/3 DUTY Drive or 1/4 DUTY Drive switching control data

This control data bit selects either 1/3 duty drive or 1/4 duty drive when the STATIC pin is low level.

STATIC Pin Input

Duty Drive Scheme

Output Pin State (COM4/SEG106)

Low level

1/4 duty drive

COM4

1/3 duty drive

SEG106

High level

Always “0”

static drive

SEG106

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